In the title spiro-phosphazene derivative, C33H46N9OP3, the phosphazene and six-membered N/O rings are in flattened chair and twisted-boat conformations, respectively. The naphthalene ring system and the pyridine ring are oriented at a dihedral angle of 41.82 (4)°. In the crystal, weak C-HO hydrogen bonds link the molecules related by translation along the a axis into chains. C-H interactions aggregate these chains into layers parallel to the ab plane.

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: CV5414 ).

Acknowledgements

The authors are indebted to Anadolu University and the Medicinal Plants and Medicine Research Centre of Anadolu University, Eskisehir, Turkey, for the use of X-ray diffractometer. The authors gratefully acknowledge the Kirikkale University Scientific Research Projects Coordination Unit (grant No. 2009/42), the Scientific and Technical Research Council of Turkey, TÜBITAK (grant No. 106 T503) and the Hacettepe University Scientific Research Unit (grant No. 02 02 602 002) for financial support.

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